Organisers of the Land of Song Festival have announced they are scrapping a controversial £42 charge per choir member.
The "cheeky" fee prompted some choirs to pull out of the event after realising they would be charged thousands of pounds to take part.
In a social media post, it was confirmed the fee had been scrapped, and those entering were only required to pay the flat fee of £150 per choir.
The two-day festival is set to take place in May 2027, with Italian tenor Andrea Bocelli featuring on the Saturday, marking the first time he has played in Wales for 22 years.
Several conductors threatened not to take part when the festival's pricing was revealed in September.
About 40 choirs or singing groups took to social media to say they would refuse to take part in the event because of the cost.
It led to concerns about the festival's viability, with a member of the Glynneath Male Voice Choir suggesting there was a "good possibility" it would not go ahead.
But, on the Land of Song Festival Facebook page, a message from the Côr World Choir & Young Voices CEO said they had "got something important wrong" with the individual chorister registration.
"An event celebrating the joy, community and inclusivity of singing should not create unnecessary barriers to taking part," the post read.
"So we have changed it. If you've already paid an individual registration fee, you will receive an automatic refund. No action is needed."
Bocelli will make way for up to 20,000 choristers on the second day as they are accompanied by the BBC National Orchestra of Wales.
He said he was excited to add Cardiff to the "many extraordinary places around the world" he had performed in, after last performing in Wales in 2005.
Bocelli added: "The country's rich choral heritage and deep connection with music make this city a fitting setting for this special concert."
The festival began in Cardiff in 1992, and is one of the largest celebrations of collective singing staged in Wales, honouring the country's heritage and global choral tradition.
Jennifer Burke, from Cardiff Council, said in August the city was "looking forward to welcoming this new festival to Cardiff to be part of the city's diverse and exciting musical future".